The Texans have reached an agreement with their first free agent Green Bay running back Ahman Green.

Green, 30, is signing a four-year contract worth $23 million, including $6.5 million in guarantees.

Green has been one of the most productive running backs in the NFL for the past seven years.

The former Nebraska running back enjoyed his five best seasons (2000-2004) when Mike Sherman was the Packers head coach. During that period, he never rushed for fewer than 1,163 yards. His best season was 2003 when he rushed for 1,883 yards and scored 20 touchdowns.

Green immediately becomes the starter, from a group that includes Wali Lundy, Chris Taylor and Samkon Gado.

Green, a No. 1 pick by Seattle in 1998, is a ten-year veteran, who rushed for 1,059 yards and scored six touchdowns last season.

"We're excited to get this deal done because Ahman's been a successful running back in this league for a long time," general manager Rick Smith said. "We're going to hitch our wagon to him.

"We're not worried about his age because he takes great care of himself and is in great condition. One of the many things we like about him is his versaility. Not only can he run the ball, but he's an excellent receiver, too. We think he's an ideal fit for our system."